Refrigerating apparatus



March 25, 1941.I J. R. HQRNADY REFRIGERATING APPARATUS Filed sept. 24, 1957 Zyl* di INVE TOR. BY www1? ATTORNEYS.

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bricant under pressure through the passage 135 leadingto the bearing surfaces of the rst pitman. The pump also discharges lubricant under pressure through a conduit (not shown)4 which joins up with passage 66 leading to the chamber All `adjacent the shaft seal 3l. With this arrangement, it Will be noted that the shaft seal is completely surrounded with lubricant under pressure at all times so that there is no possibility of outside air being drawn into the crankcase at the seal because of a lower pressure in the crankcase than on the outside. Furthermore, with this arrangement no refrigerant will escape at the seal since the seal is completely surrounded by lubricant. With the above described lubricating system the compressor operates very silently.

Referring now to Fig. 1, it will be noted that within the cylinder head 3l, I have provided a baiile 50 which is mounted directly above the discharge valve and is spaced from the end wall of the cylinder head 37. The baiiie 5@ is held in place by screws 5l which screw into the projections 52 provided on the cylinder head 3l. The compressed medium strikes against the baffle 50 and, therefore, does not have a chance to impinge against the metallic wall of the cylinder head. This results in more quiet operation. Furthermore, tests show that the valve noises are largely absorbed by the baie 50 with the result that the amount of valve noise transmitted to the exterior of the compressor is materially reduced. The arrangement of the baffle is such that it tends to eliminate the usual rebounding of the sound waves within the cylinder head.`

The particular baffle shown includes a frame member 5d which supports a pair of screen elements 56 which in turn hold the asbestos fibers 51 in place. The asbestos fibers very eiectively silence the noises yet do not deteriorate when exposed to the flow of lubricant and refrigerant. Obviously, such materials as sponge rubber which have been used exteriorly to deaden compressor noises could not be used in the cylinder head.

While I have shown a baffle utilizing asbestos bers held in place by the metallic screens, other materials can be used for the sound deadening baie. The material selected-however, must be a material which will not be affected by the refrigerant and the lubricant used in the system. A wooden block, for example, can beused; but I have found that the baiie utilizing asbestos fibers is very satisfactory both from the standpoint of sound deadening and also from the standpoint of permanency.

With the above described arrangement the compressor noises are materially reduced without in any manner reducing the operating efficiency of the compressor.

While the form of embodiment of the invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming Within the scope of the claims which follow.

What is claimed is as follows:

l. In a refrigerant compressor, a cylinder, a piston operating within said cylinder, a cylinder head, a discharge port between said cylinder and cylinder head, an outlet for the compressed refrigerant, and a sound deadening baffle suspended substantially centrally within said cylinder head and substantially out of the path of refrigerant flow whereby said bale deadens the sound but does not materially hinder the ow of refrigerant nor the transfer of heat.

2. In combination with a refrigerant compressor having a port from which a mixture of u lubricant and refrigerant are discharged, a discharge chamber, sound deadening material spaced from the walls of said chamber against which said mixture is adapted to discharge, and an outlet from said discharge chamber, said outlet andv said port both being located on the same side of said sound deadening material.

3. In a refrigerant compressor having a refrigerant discharge DOrt. a valve for said port, means enclosing said discharge port and forming a discharge chamber, an outlet from'said chamber, and nonresonant material mounted within said chamber for deadening noises, said port and said, outlet both being located on the same side of said material.

JAMES R. HORNADAY. 

